Google found this.
https://wiki.documentfoundation.org/Documentation/Calc_Functions/ROUNDDOWN

On Fri, Feb 17, 2023 at 8:11 AM Michael via PLUG-discuss <
plug-discuss@lists.phxlinux.org> wrote:

> how do I get libre calc to round down to the nearest penny? all my
> googling has shown is rounding down to the nearest whole integer.
>
> --
> :-)~MIKE~(-:
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-- 
A mouse trap, placed on top of your alarm clock, will prevent you from
rolling over and going back to sleep after you hit the snooze button.

Stephen